/*
      流动纹理线
      color 颜色
      duration 持续时间 毫秒
      */
function EllipsoidFadeMaterialProperty(color, duration) {
  this._definitionChanged = new Cesium.Event();
  this._color = undefined;
  this._colorSubscription = undefined;
  this.color = color;
  this.duration = duration;
  this._time = new Date().getTime();
}

Object.defineProperties(EllipsoidFadeMaterialProperty.prototype, {
  isConstant: {
    get: function () {
      return false;
    },
  },
  definitionChanged: {
    get: function () {
      return this._definitionChanged;
    },
  },
  color: Cesium.createPropertyDescriptor("color"),
});
EllipsoidFadeMaterialProperty.prototype.getType = function (time) {
  return "EllipsoidFade";
};
EllipsoidFadeMaterialProperty.prototype.getValue = function (time, result) {
  if (!Cesium.defined(result)) {
    result = {};
  }
  result.color = Cesium.Property.getValueOrClonedDefault(
    this._color,
    time,
    Cesium.Color.WHITE,
    result.color
  );

  result.time = ((new Date().getTime() - this._time) % this.duration) / this.duration;
  return result;

  // return Cesium.defined(result) || (result = {}),
  //     result.color = Cesium.Property.getValueOrClonedDefault(this._color, time, Cesium.Color.WHITE, result.color),
  //     void 0 === this._time && (this._time = time.secondsOfDay),
  //     result.time = time.secondsOfDay - this._time,
  //     result
};
EllipsoidFadeMaterialProperty.prototype.equals = function (other) {
  return (
    this === other ||
    (other instanceof EllipsoidFadeMaterialProperty &&
      Property.equals(this._color, other._color))
  );
};
Cesium.EllipsoidFadeMaterialProperty = EllipsoidFadeMaterialProperty;
Cesium.Material.EllipsoidFadeType = "EllipsoidFade";
Cesium.Material.EllipsoidFadeSource =
  "czm_material czm_getMaterial(czm_materialInput materialInput)\n" +
  "{\n" +
  "czm_material material = czm_getDefaultMaterial(materialInput);\n" +
  "material.diffuse = 1.5 * color.rgb;\n" +
  "vec2 st = materialInput.st;\n" +
  "float dis = distance(st, vec2(0.5, 0.5));\n" +
  "float per = fract(time);\n" +
  "if(dis > per * 0.5){\n" +
  "material.alpha = 0.0;\n" +
  "discard;\n" +
  "}else {\n" +
  "material.alpha = color.a  * dis / per / 1.0;\n" +
  "}\n" +
  "return material;\n" +
  "}";
Cesium.Material._materialCache.addMaterial(Cesium.Material.EllipsoidFadeType, {
  fabric: {
    type: Cesium.Material.EllipsoidFadeType,
    uniforms: {
      color: new Cesium.Color(1.0, 0.0, 0.0, 1),
      time: 0,
    },
    source: Cesium.Material.EllipsoidFadeSource,
  },
  translucent: function (material) {
    return true;
  },
});